Do Now
Write your answers on a piece of paper:
•
What is a force?
•
How do you find net force?
•
What are Newton’s Three Laws of Motion?
(Describe each of them as much as possible)
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
30 min
• Forces Tug of War Lab
15 min
• Bounciest Slime Competition
5 min
• Lab Notebooks
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
30 min
• Forces Tug of War Lab
15 min
• Bounciest Slime Competition
5 min
• Lab Notebooks
Important Dates and Reminders

Labs ALL week long
 Bring

your composition book!
Past Due Work Due Friday
 News
Projects
 Exam Reflections
 Homework

Extra Credit Opportunities Due FRIDAY
 Lab
Notebooks
 Extra News Project

Blood Drive Friday!
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
30 min
• Forces Tug of War Lab
15 min
• Bounciest Slime Competition
5 min
• Lab Notebooks
This Week’s Schedule

Each day will be devoted to an inquiry-based lab
from one of the units we did:
 Day
1: Motion
 Day 2: Forces
 Day 3: Momentum & Collisions
 Day 4: Heat
 We
skipped the work, power, energy unit since we devoted
a whole week to the roller coaster lab 
Definition of Force

A force is a push or
pull on an object
based on its
interaction with
another objects.
 Tug
of war is a great
example of this
 The
participants push
with their legs off the
ground
 The participants also
pull on the rope
Newton’s
st
1
Law of Motion
Formal Definition: An object at rest stays at rest
and an object in motion stays in motion with the
same speed and in the same direction unless
acted upon by an unbalanced force.
Newton’s
st
1
Law of Motion
Simpler Definition: Basically, objects keep on
doing what they’re doing unless something tries
to change them.
Recognizing Unbalanced Forces
Unbalanced Forces happen when forces are
opposite but NOT equal
Net Force means the OVERALL force.
To find it, subtract the smaller force from the bigger force. Net force is in
the direction of the bigger force.
Review: What is acceleration?
The change in velocity over time – how fast something speeds up
or slows down.
Review: What does Newton’s 2nd Law of Motion say?
An object accelerates when an unbalanced net force is applied to
it.
- In equation form, Newton’s 2nd Law of Motion says that force
equals mass times acceleration OR
Force = mass x acceleration (F=ma)
Newton’s
rd
3
Law of Motion
For every action, there is an equal and
opposite reaction
Forces Lab: Tug of War



(5 min): Start out by writing the question you would
like to test, making a hypothesis for that question,
developing a procedure to test that question (be
specific!!!) and writing the materials you need.
(7 min): We will test out three different
experiments and record them in the table.
(8 min): Complete the analysis and conclusion for
YOUR experiment or one of your choice.
 Don’t
complete this for all three that we do!
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
30 min
• Forces Tug of War Lab
15 min
• Bounciest Slime Competition
5 min
• Lab Notebooks
Bounciest Slime Competition
The object of this is to HAVE FUN  The side of
the room that creates the bounciest slime in 10
minutes WINS!
The Science of Slime



The glue has an ingredient called polyvinyl acetate,
which is a liquid polymer.
The borax links the polyvinyl acetate molecules to
each other, creating one large, flexible polymer.
This kind of slime will get stiffer and more like putty
the more you play with it.
Today’s Agenda
5 min
• Do Now
5 min
• Important Dates
30 min
• Forces Tug of War Lab
15 min
• Bounciest Slime Competition
5 min
• Lab Notebooks
Notebook Guidelines
I.
II.
III.
IV.
V.
VI.
Question
Hypothesis
Procedure
Observations
Data
Initial Conclusions
Each of these sections must be in your notebook with a
HEADING and NEATLY WRITTEN. Table of Contents
should be updated as well.
Example Table of Contents
Table of Contents
I.
Lab 1: Water Drops on a Penny
PG. 1
I.
Lab 2: Trash Bag Test
PG. 4
I.
Lab 3: Music Effect on Heart Rate
PG. 6
Example Lab Entry
Lab 1:
Water Drops on a Penny
August 23, 2011
I.
Question
How is the surface tension of water affected by soap?
II.
Hypothesis
The surface tension of water is decreased by soap.
III.
Procedure
Carefully add water, one drop at a time…
Data: Water Drops on a Penny
Experiment
Trial 1
Trial 2
Average
Regular Water
18
22
20
Soapy Water
9
11
10
Conclusions


You will have a DETAILED conclusion in your lab
report so this should only be 2-3 sentences!
I want to know your initial reactions to what
happened in the lab.
This Week’s Expectations
You will need to complete a lab notebook for
TWO of the FOUR labs we do this week. Extra
entries will be extra credit (highly encouraged).